well i just had my engine rebuilt , and towards the end of the break in period (500 miles ) i got a CEL , went to Autozone and it was a random misfire on all 4 cylinders...

well my alternator died a couple days later , so while i sourced an alternator i replaced the cap , rotor , spark plugs , and the wires...

put another alternator in today , went for a drive...all was good and 30 min later...CEL blinking again...

i thought i surely solved the problem , even after finding my rotor screw chilling at the top of my distributor...what can be done??

 

are your valves adjusted properly? Have you checked the timing?

I had a similar problem with mine, I had messed up the adjustment, but re-did it and it ran great afterward.

also, what do you mean by rebuilt? stock components etc?

 

yea , new crank, rods , bearings , rings , headgasket , oil pump , water pump , timing belt and gaskets/seals...i do need to adjust my valves...

my o2 sensor is unplugged also...

 

what was the exact code?

 

im guessing the P1300 or something like that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Benefitx &raquo;</TD></TR><TR><TD CLASS="quote">yea , new crank, rods , bearings , rings , headgasket , oil pump , water pump , timing belt and gaskets/seals...i do need to adjust my valves...

my o2 sensor is unplugged also...</TD></TR></TABLE>

May i ask why you replaced all those parts?
Was there a problem with the motor ?
I ask because it seems like alot of money to put into OEM parts , ya know ?

 

motor was knocking from being run low on oil due to bad rings...

dont remember the exact code , but its a random misfire on all 4 cylinders

 

yea ive replaced alot of parts, i dont know why it is still misfiring , the only other thing that might be causing it is the o2 sensor being unplugged...might replaced the spark plugs again maybe they are fouled??

 

i just took a morning cruise....no blinking CEL but the engine was not fully warmed up yet...

 

injector or fuel pump problems? are they new injectors and pump or did you have them stored somewhere while the motor was being rebuilt?

 

fuel pump is a walbro 255 on stock fuel rail/injectors/FPR...

i was thinking fuel also because it did not throw any codes in the break in period then i replaced everything when it did...

 

are there any other codes? when does the code come on? during vtec? idle? normal driving?

per Helms, possible causes:

Fuel pump insufficient fuel pressure, amount of flow
fuel line clogging, blockage, leakage
fuel filter clogging
fuel pressure regulator stuck open
distributor malfunction
ignition coil wire open/leakage
ignition control module malfunction
valves carbon deposit
compression low
IAC vavle malfunction
Fast idle thermo valve malfunction
fuel does not meet owners manual spec, lack of fuel
VTEC system malfunction

test procedures and more info on page 11-78 of the integra manual

 

A good start would be connecting that o2 sensor, and replacing the plugs depending on their condition.

 

since its all cyl, I dont think its anything plug/wire related. gotta be fuel or distro IMO.

Im also running a 255lph with stock ECU, injectors, FPR, etc in my ITR and have a misfire code on cyl 2. gonna change out the pump to stock and get another plug/wire for #2 and see what that does. already changed cap/rotor/plugs before.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2R &raquo;</TD></TR><TR><TD CLASS="quote">since its all cyl, I dont think its anything plug/wire related. gotta be fuel or distro IMO.

Im also running a 255lph with stock ECU, injectors, FPR, etc in my ITR and have a misfire code on cyl 2. gonna change out the pump to stock and get another plug/wire for #2 and see what that does. already changed cap/rotor/plugs before. </TD></TR></TABLE>

You need the o2 sensor for part throttle operation. That would cause misfire problems in all cylinders if it's not working at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vinuneuro &raquo;</TD></TR><TR><TD CLASS="quote">

You need the o2 sensor for part throttle operation. That would cause misfire problems in all cylinders if it's not working at all.</TD></TR></TABLE>

did you ninja edit that bc I dont remember seeing O2 sensor in there lol

but yes plug in that O2 unless you are running some kind of EMS that does not require it that that wouldnt be the case. i assume we are talking about a stock ECU here?

 

No edit, maybe I should've used O instead of o?

 

or I can just pay more attention when Im reading something

 

thank you everyone for chiming in...

yea the o2 sensor is brand new bosch, paid 200$ for it...but when i was taking the motor out it was unplugged from the harness and the o2 sensor...and i have no idea where the wires go...

i am going to ttry seafoaming it today and if anyone can help my o2 sensor problem..

 

why do u need to seafoam it??

is it a wideband sensor or a replacement narrowband? sensor shouldnt be difficult to wire in assuming your ECU and harness and sensor are 4 wire...

this seems to have sorta turned into a can of worms

 

dont really understand the can of worms metaphor but yea its 4 wire...

 

if you need help wiring up a 4 wire sensor then search the archives that info is posted numerous times.

 

yea it doesnt make any sounds...

update-- i just put in a bottle of STP octane booster , and filled up...drove it and the light is not blinking (for now , i hope that did it..)

about to seafoam in a little bit...

 

im not sure how seafoam would help? isn't the motor freshly rebuilt?

I was under the impression that seafoam just got rid of the carbon build up

 

seafoam on fresh built motor = no seal on rings....
i say do it so im not the only one.....we be like twins...black right lower bumper from all the smoke especially on vtecccccccccc.